阅读说明：本技术 直立绵打孔材料及其制备方法 (Vertical cotton punching material and preparation method thereof ) 是由 张荣龙 陈志伟 于 2019-12-07 设计创作，主要内容包括：本发明公开了一种直立绵打孔材料的制备方法,包括如下步骤：1)装配模具：所述模具包括相互配合的上模具、下模具以及用于在合模时定位所述上模具和下模具的定位销,所述上模具包括上模板、固定在所述上模板上的冲头,所述冲头与上模板垂直设置；所述下模具包括下模板,所述下模板上开设有贯穿所述下模板厚度方向的冲腔；所述冲头为圆柱体；2)冲孔：直立绵材料移动至上模具和下模具之间,上模具和下模具合模对直立绵进行冲孔,冲孔时,直立绵材料的进料速度为1-2m/min。本发明的直立绵打孔材料的制备方法,解决了冲孔后洞口毛边和垂直光滑度的问题,不仅使产品洞口光滑,孔径变形小；且可以不用垫硬纸等介质,减少了材料浪费和脏污引起的人工浪费。(The invention discloses a preparation method of a vertical cotton punching material, which comprises the following steps: 1) assembling a mould: the die comprises an upper die, a lower die and a positioning pin, wherein the upper die and the lower die are matched with each other, the positioning pin is used for positioning the upper die and the lower die when the die is closed, the upper die comprises an upper template and a punch fixed on the upper template, and the punch is perpendicular to the upper template; the lower die comprises a lower template, and a punching cavity penetrating through the lower template in the thickness direction is formed in the lower template; the punch is a cylinder; 2) punching: and (3) moving the vertical cotton material between the upper die and the lower die, closing the upper die and the lower die to punch the vertical cotton, wherein the feeding speed of the vertical cotton material is 1-2m/min during punching. The preparation method of the vertical cotton punching material solves the problems of burr and vertical smoothness of the hole after punching, and not only ensures that the hole of the product is smooth, but also has small hole diameter deformation; and the medium such as hard paper and the like is not needed, so that the material waste and the labor waste caused by dirt are reduced.)

1. A preparation method of a vertical cotton punching material is characterized by comprising the following steps:

1) assembling a mould: the die comprises an upper die, a lower die and a positioning pin, wherein the upper die and the lower die are matched with each other, the positioning pin is used for positioning the upper die and the lower die when the die is closed, the upper die comprises an upper template and a punch fixed on the upper template, and the punch is perpendicular to the upper template; the lower die comprises a lower template, and a punching cavity penetrating through the lower template in the thickness direction is formed in the lower template; the punch is a cylinder; when the die is installed, the upper die and the lower die are matched and fixed by the positioning pin, and then the whole die is moved to punching equipment; then, fixing the lower template according to hole positions, reducing a pressure plate on the punching equipment to a distance difference of 0-1 mm with the upper surface of the upper template, and then installing fixing screws, so that the upper template is fixed on the pressure plate;

2) punching: and (3) moving the vertical cotton material between the upper die and the lower die, closing the upper die and the lower die to punch the vertical cotton, wherein the feeding speed of the vertical cotton material is 1-2m/min during punching.

2. The method for preparing vertical cotton punched material according to claim 1, wherein the upper template and the lower template are provided with positioning holes matched with the positioning pins, positioning sleeves are arranged in the positioning holes, and the inner diameters of the positioning sleeves are matched with the outer diameters of the positioning pins.

3. The method for preparing the vertical cotton punched material according to claim 2, wherein the length of the positioning pin is greater than the thickness of the upper template or the lower template, and the positioning pin is fixed in a positioning sleeve of the lower template.

4. The method for preparing standing cotton punched material according to claim 1, wherein both ends of the positioning pin are chamfered.

5. The method for preparing standing cotton punched material according to claim 1, wherein the inner diameter of the punching cavity is 0.02-0.05mm larger than the outer diameter of the punch.

6. The method for preparing vertical cotton punched material according to claim 1, wherein the total thickness of the vertical cotton material in punching in the step 2) is not more than 1 cm.

7. The method for preparing vertical cotton punching material according to claim 1, wherein a suction device for sucking away the cotton scraps after punching is further arranged below the lower template.

8. The method for preparing vertical cotton punched material according to claim 1, wherein the lower end of the punch is higher than the upper surface of the vertical cotton material by 3-5mm when the mold is not closed.

9. The method for preparing standing cotton punched material according to claim 1, wherein the surface roughness of the outer wall of the punch and the inner wall of the cavity is less than 16.

10. A standing cotton punched material produced by the production method according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of preparation of vertical cotton materials, in particular to a production and preparation method of a vertical cotton punching material and the vertical cotton punching material prepared by the method.

Background

A spliced non-woven fabric thin-cup bra product is generally used in large-cup bra products, is commonly used in the current market as a sponge composite material or a vertical cotton composite material, and is upgraded by regularly punching the sponge material into holes of 2-3 mm and then compounding the materials. Compared with the sponge material, the vertical cotton material is renewable, recyclable, non-yellowing and good in air permeability, and the air permeability of the vertical cotton material is 1.5-3 times that of the sponge material. If the vertical cotton material can be punched, the air permeability is better, and the bra is extremely suitable for being applied to the bra products in spring and summer. However, if the vertical cotton material is used in the sponge punching mould and process on the market, there are some problems, mainly: 1. the hole is not smooth and has burr phenomenon; 2. fiber is discharged from the zip-top tape after punching; 3. in order to solve the problem of punching and wire drawing, a layer of hard medium is generally filled below a material to form hard cutting and reduce the wire drawing phenomenon, hard paper is usually used as the medium, but in such a way, paper scraps and other dirt are easily adhered on the material, and the dirt is still adhered to the material by using an adhesive tape in the follow-up process, so that the process is very complicated.

The main reasons for the above problems are: mechanical punching dies of sponge punching material products in the existing market are all knife edge type cutting dies, and the diameter of a knife edge is generally smaller than that of a cylinder, so that positioning punching is facilitated, and die assembling is convenient. The structure of the vertical cotton material is mainly formed by mixing and winding fibers and bonding fibers with low melting point, and the structural tightness among the fibers cannot be compared with materials such as sponge and the like. Therefore, due to the structural reasons of materials, the punched vertical cotton produced by using the current punching die has unsmooth holes and burrs, and is easy to be drawn and taken out of fibers, so that the structure of the vertical cotton is loosened and changed. During production, a piece of kraft paper or other materials is generally required to be added below the material to be punched so as to increase the extrusion compactness and reduce the generation of the wire drawing problem, but the problem of unsmooth hole opening still cannot be solved. And the punched material has the problem of poor hole verticality when observed under a magnifying glass. As shown in figure 1, the hole type verticality of the vertical cotton punching material prepared by the existing mould is poor, and the use requirement cannot be met.

Disclosure of Invention

In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide an improved method for preparing vertical cotton punched material.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a vertical cotton punching material comprises the following steps:

1) assembling a mould: the die comprises an upper die, a lower die and a positioning pin, wherein the upper die and the lower die are matched with each other, the positioning pin is used for positioning the upper die and the lower die when the die is closed, the upper die comprises an upper template and a punch fixed on the upper template, and the punch is perpendicular to the upper template; the lower die comprises a lower template, and a punching cavity penetrating through the lower template in the thickness direction is formed in the lower template; the punch is a cylinder;

2) punching: and (3) moving the vertical cotton material between the upper die and the lower die, closing the upper die and the lower die to punch the vertical cotton, wherein the feeding speed of the vertical cotton material is 1-2m/min during punching. Too low a feeding speed affects productivity, and too high a feeding speed causes easy longitudinal stretching during punching, resulting in poor punching. And when punching operation, preceding material end and the back of receiving will keep certain allowance, need not have tension promptly to lead to upright cotton material too tight, can lead to upright cotton material to stretch to some extent when punching a hole like this, and the hole that finally punches out has the deformation, can't use.

The punching head is a solid cylinder, the action surface of the bottom is a flat opening, namely, the bottom of the punching head is not provided with a chamfer, and when punching, the punching head is punched in a hard mode, the problem that fibers are easily pulled due to a large-fillet knife edge adopted in the prior art is avoided, paperboards and the like are not required to be placed on the upper and lower sides of a material in the traditional punching process, and material pollution and waste caused by paper scraps are avoided. When the length of the punch is processed, the integral error is not more than 0.05mm, and striking installation is adopted during installation so as to prevent the verticality of the punch from being influenced.

The parts of the punch and the punching cavity need to be subjected to quenching and tempering heat treatment process so as to improve the hardness of the corresponding parts, so that the parts can be more clean and more free in punching and the problem of wire drawing can be avoided. And in some embodiments the punch outer wall and/or the punch cavity inner wall has a polytetrafluoroethylene coating having a thickness of 0.15-0.25mm, preferably 0.2 mm. The polytetrafluoroethylene coating not only can be better avoid the problem of spinning, but also can avoid the problem of material adhesion caused by high temperature generated during rapid punching.

Quenching and tempering heat treatment is a heat treatment process for improving the comprehensive mechanical property of steel materials. Namely, high-temperature tempering treatment is carried out after quenching. The steel part has high strength, excellent toughness, plasticity, cutting performance, etc. This is a routine technical measure for a person skilled in the relevant art.

Specifically, in some embodiments, when the die is installed, the upper die and the lower die are fixed in a matched manner by using the positioning pins, and then the die cutting equipment is integrally moved; and then fixing the lower template according to the hole positions, reducing the pressure plate on the punching equipment to the distance difference of 0-1 mm with the upper surface of the upper template, and installing fixing screws, thereby fixing the upper template on the pressure plate. When fastening the screw, attention needs to be paid to four-point synchronous tightening of the diagonal to keep balance.

Preferably, the upper template and the lower template are provided with positioning holes matched with the positioning pins, positioning sleeves are arranged in the positioning holes, and the inner diameters of the positioning sleeves are matched with the outer diameters of the positioning pins.

More preferably, the length of the positioning pin is greater than the thickness of the upper template or the lower template, and the positioning pin is fixed in the positioning sleeve of the lower template.

Preferably, both ends of the positioning pin are chamfered. The locating sleeve is matched with the locating pin, and the upper template and the lower template are guided when the die is closed. The positioning sleeve and the positioning pin are also processed by adopting a quenching and tempering heat treatment process.

Preferably, the inner diameter of the punching cavity is 0.02-0.05mm larger than the outer diameter of the punch. As in some embodiments, the diameter of the punch is 5 mm-0.02-0.04 mm, and the diameter of the punching cavity is 5mm + 0-0.02 mm, i.e. the inner diameter of the punching cavity is preferably greater than the outer diameter of the punch by 0.02 mm. The interval undersize, drift and die cavity bump easily when the compound die, lead to the mould to damage, and the interval is too big, can lead to the pass to warp to some extent or damage when punching a hole, and the product can't satisfy the user demand.

Preferably, the thickness of the standing cotton material at the punching of step 2) is not more than 1 cm. The thickness of the vertical cotton material is the total thickness in punching, namely when multiple layers of vertical cotton are overlapped together for punching, the total thickness of the multiple layers of vertical cotton is not more than 1cm, so that a punching hole is smooth, the vertical effect is good, and the problems of poor punching, hole deformation and the like caused by over-thick materials are prevented.

Preferably, a suction device for sucking away the punched cotton scraps is further arranged below the lower template. Due to the adoption of the solid punch, the cotton scraps after punching cannot be contained in the punch, and the cotton scraps after punching can be timely removed from the vertical cotton material by adding the suction device.

Preferably, when the mold is not closed, the lower end of the punch is 3-5mm higher than the upper surface of the vertical cotton material. The material can be touch to the lower extreme that the interval undersize can lead to the cope match-plate pattern drift, and the interval too big can lead to the stroke of cope match-plate pattern when punching a hole too big, has influence to the stability of operation, leads to the drift to touch the die cavity easily.

Preferably, the surface roughness of the outer wall of the punch and the inner wall of the die cavity is less than 16. In some embodiments, the surface roughness of the lower surface of the upper template and the upper surface of the lower template may also be set to be less than 16 to enable better matching of the associated components.

The invention also provides the vertical cotton perforated material prepared by the preparation method, which is suitable for preparing bra products.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: according to the preparation method of the vertical cotton punching material, the problems of burr and vertical smoothness of the hole after punching are solved by arranging the cylindrical solid punch and matching with the process during punching, so that the hole of the product is smooth, the aperture deformation is small, and the permeability is better; and the medium such as hard paper and the like is not needed, so that the material waste and the labor waste caused by dirt are reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is an enlarged schematic view of a vertical cotton punched material obtained by using a conventional mold and a conventional manufacturing process in the background art;

FIG. 2 is a schematic view of a punching mold suitable for upright cotton material according to a preferred embodiment of the present invention;

FIG. 3 is an exploded view of a perforation mold suitable for use with vertical cotton material in accordance with a preferred embodiment of the present invention;

FIG. 4 is an enlarged schematic view of a vertical cotton perforated material manufactured by the method for manufacturing a vertical cotton perforated material according to the preferred embodiment of the present invention;

wherein: the stamping die comprises an upper die plate-1, a lower die plate-2, a punch-3, a punching cavity-4, a positioning pin-5, a positioning sleeve-6, a positioning hole-7, a vertical cotton material-8 and a hole-9.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.